After installing Snow Leopard (10.6.3) over my 10.5.8 OSX, my 'Incompatible Software' folder was empty, save for a Read Me.rtf file that had no application-specific details inside. So does this mean I had NO incompatible software? I have the following apps:
Adobe Creative Suite CS3
MS Office 2008
Finale 2009 (music notation software)
ProTools LE appears to be missing, but is not listed in the Incompatible Software folder
FYI - Adobe Illustrator quit when I opened a file for the first time. Seems to be working now.